Custom modded Estes Outlander. Original was said to be underpowered and have unstable/unpredictable flight.  Since I thought it was an awesomely cool "definitely not 3FNC" design, I went about fixing the said deficiencies.  First I started with a 24mm Motor mount so that I can fly this heavyweight on D12s.  Next I noticed that the "fins" (lander legs) were designed so that they can actually flop around!  Can you imagine a rocket with 4 floppy fins?  I fixed that with added "bushing" spacers using balsa shims and I also notched the end stop a bit so that the fins stay in place on lift off.  Seems to have worked well since first flight was a very good one. I also added 1oz of clay to the nose since I was flying on Ds.